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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a815d0697e8afe9acc5550f24ae6d320daf2b2e67adce062376eed2b646d0c34' 
  AND token = 'EDmxqd8ncvYn/McAv1rhivsmj1U35la/N3XM1y7Tnr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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