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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a3e9007d12278b201be0fb5290eba0c8782ec791412ac7a8005e3cb27b029c' 
  AND token = 'fFPtZpXCfkGgTWQCeFf1Mr2GW7WJz0fsO12QdkgIRQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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