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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93084eae9973b6668c228bfce6d1f8ecb8ec3feda5b17995dc38fbcc7c502f1' 
  AND token = 'Mfa/pDzoJGKuSqBfM8a041MGN0xRTIjVhZ1HxhaKnkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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