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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a065d525e2f00d02895ab05203800231efede8ba6e60785ccbd3ac2cf54f764' 
  AND token = 'sEmB3fjjBJLVOcne68VeMBhVdApcrF/W+Gmdne6vN5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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