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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5e948a524b26d5059915e3d6a2610efa34a17cbb7fbef8f5d37b1cc0aa6eae' 
  AND token = 'pJzF/JTfmlQ+lyOdROcbf7Jnr8FORp/T/olIUB6d8As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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