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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4530c546f118fd2281f15ec994216385610717ece28fc645be2a3e128beed6cb' 
  AND token = 'W0G0CbEE6Rkh8nDOjdaZ7fvsK1PeDzpShvcoI4L13Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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