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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0112417c4b2f1e040b4bf3ddf60f53ba77ff87520adf0a8b8eb4c626f55efe9' 
  AND token = 'kqzWjib+gK52tLQsi0Ia8t4xT74irob55SsLzwmhOwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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