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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd485762fbfcec33bae81e59f28d0be4f48d1c8c7139caf261d03855535a7038a' 
  AND token = '9TmoE9W9iWOrGYdHdyYewYi1lNiFzP5xy101VnDv8CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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