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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89306827bf15b8cb923cf4834dc1b6057da216265d63f7d26e688d09b951c360' 
  AND token = 'WEukV7vz8zyoqBQTmVYnMuiU3rEr0oHDGnx/RdmoXWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}