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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d96010f0404c26c18c862ab16724a13862c7262461b87480d1b505e22326c8' 
  AND token = '246QgQo3rznIiYhoS16il6rA4eO81uecy2Zfi4SMZSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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