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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff142feefb6ef6b2eccb62959093fdbc8d1a54231ce384c1c8e03f985bc59ae4' 
  AND token = 'QhGUrqdzngp6rj83etfSCeYMQflt4iw3KG5U9z/DsqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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