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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b8a151391d57b3f4c789f79296d9776cafe40c78d52afc85e82eb5e23e48f5' 
  AND token = 'tztQs9kCfSn16VcQG6elHLkVTsRffNkZ1rgkFAgVi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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