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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665b5d2912fe7365d49806ace7f64ec107dd5c5d2c9a2450cbecf19d78f7b7e2' 
  AND token = 'gvvK8o1aXrqQrir/pCU7kLjyHXzKb4chmpnO4f0yxP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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