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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42938134e202003d64b321dd7c3e9d8a9c8557473c5e7d173596e76c2c0128a' 
  AND token = '4sfo/Yw+a1xDuebflEudvGb1erpzKRfltzCUk3jTtnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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