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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5a9b82648de16181865a6e119879cb9325d454680f1e2c61b3053c3423aab3' 
  AND token = 'kG4Na83ySPQZz1sU4E8K5csNUpq4PHFDaG8J5x+d+ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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