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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd0c6aef5fdbd06cbbe29a7a340c32581be198bcd2279b57118af49e138b0c8' 
  AND token = '7/zBVNAtF7dlRE+Wu8evPYvUNbgfPn601lOVf88vdio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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