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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669dadd7c95646a86cbb9ecd09e88eff01d6b0aee71cb23af95ee18fc1009c3a' 
  AND token = 'd5XWVHdQ2fO42AHG/xiYvidfR0hUUCne9gpvpVqyt30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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