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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40510ead65d093233eafb166380dfc0bcd3682f779d8d470c2cfbcaabc2a8704' 
  AND token = 'js60z+kae4sMwOZNtPl1gTy/H6r7i80l49Y2QrXiG5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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