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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b0c1a6b631d2d619bfdad52720b6f79d4540a9065b1f540a9900ab08160aea' 
  AND token = 'W+JT2tmNGRokQgZZ7ks6OE0wJo20p2jTvX+rfoVkHlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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