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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f7e941729e6cd17aa077b90c39a4423492929fa42e1e1e937ba6970525312b' 
  AND token = 'Qcs16TU3LA8QGgRRSXLU2FEYiouQvs9l6+1LPvnR9fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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