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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbbd626646a8f65880c22c52a871d37adad6ba4d4d26d7c7a204809ee3e7a31' 
  AND token = 's+5N7jJoYt53i3rN8h7lezkaIFmHhYibRadlY2NCz5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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