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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c0aae13798dec2f78a0208028e6b1904ffc17a4f02ee1bee530e41dfa37aad' 
  AND token = 'H8UgvgZkAwX5YVcd05+FHGiE9mpE1+IGP5vDTfNMCms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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