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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee014243f1e11f3e03b5f24d1360345e746a482ce36183cf52096fe6ce694c39' 
  AND token = '8llOyIDSKE6peMSTOEEv6BCfjPqyCwPYQfcAcE0yEmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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