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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3d761a15aec796d04e8d30923877495da6fd63c8a61be040f953c250d2fc2b' 
  AND token = 'LUJAn82EARBUG3+OJM7Q1DtlQ2rtk8w9Gk2PWeA4jnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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