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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4384759abba98627536a0dc227ab4b5bcedf5fd519fa3c41dbbaf0645a6501e' 
  AND token = 'g/VUtEosieER7Y4OeDm6KxSzjTbJI8xwMG/2A8qwDlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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