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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f554dad3236cf7edce96bfcce8dcdd8a64e10fa4df4003c86dcd3339df4ee19c' 
  AND token = 'AhGv+X0a0m2HNq5LOezefgi4eYnGbroKtWlqSULvSjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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