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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a0c02f110bf2e780709da9650c0d9b106c7fd664d3897a1ef21368d280ac35' 
  AND token = 'fe2vHUBWvLplztu4eMxkSLVkHHlCMA4Gu/N5/T2uWPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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