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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4294e825d46a5cd44f1039ba6c47fd90aa2516adf9dcf8ab3a00a40048bdcb2e' 
  AND token = 'Flhm8zd6P4pI1qQQLWAkT5r2JG6jtzz5bMDjXLdp2bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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