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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ca97ede8cf96096144fca77022c1663d748166df5d6f79aaf6f8adf3f5090f' 
  AND token = 'MBAS8CpO6lOaD3X0Ke1OlGASw5s1aieDhpfIQB+l5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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