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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2894dbf0589429b543b0ce75b235bf8a42cfd0211431cac3ec35faa02252b01' 
  AND token = '/eEOpwQl7fjBv//ULZN7NSnlXPqLzcILcfh0QD7+wTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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