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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcccc9a66213c04f45d69ed6b377e93ad0b60788b9f26260c21890b191a40492' 
  AND token = 'rsdMooU6H6S6IZvuhd8kNBx1g08tC0m7nx39qPCsWuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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