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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb9167622760c7b71bf94a98f6dd3359b5256db8619d56ec29d339d20776090' 
  AND token = 'J8cV6QNcnvulnIwsOWBrjliQrJrVIC+8YnJc26FzWEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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