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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916b192d41031cddbd52ae67b10c737ad2d390d731a743cf60def76ba1250ecf' 
  AND token = '6WGj/XdEjdVJF6yr6qFv4fC/7A72eKjqcx3asi//aZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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