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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec16a14b47a3954fd1e45aa42a3553a2675840665c4ac24bfcacafd4dbe1e268' 
  AND token = 'yfha1XcUpKE1Xfmn6W7clfmrhLFlfkeP90AraQi3T9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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