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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5e5962ebd0817ebb036bb1d48e6d5b0cca6a4afe53f76a2ff5d3f1839cb9de' 
  AND token = 'vFXqE7vQM+9tmeZpr09IqbyvvOscVS74LLAfumWEOcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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