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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fe05b65d30c597ef90bc84c7531b27b6b1cff8cb15cbb9d0b526f4bc5cd1c6' 
  AND token = 'eyW4uHpi1dPX7U5g5wM3vSl5j0/BbsjWcZrxp2hSLfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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