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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6e37d6e71468f7ed7a501b87866b5823be2fb7b54c6ecd2f237525a4765936' 
  AND token = '+KaX8fHRNdHttMF2pjeZ+KR0MijX6zXkzh0Wsm8Trug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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