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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e18dd8663a8aec9c3893dbe1dac02f2bd7c83cafce2743174482f7936cd8bb' 
  AND token = 'QssaJXlmdRWo2iBLsANxFjDB8DrABPTWqB39eMyLZgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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