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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809665f68cfeaa32acd95fa91d0c6c2280cffaf0093d947c15801059893bfc8a' 
  AND token = '3OvA3vGFdjtghAa+Qi4Danzk+OBy/sxB1/0KsHq3+L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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