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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc2fcf461ab9cbf22dfeec239dea0e4c5f2abf8f31b2c2c0cb8706bbb4314ec' 
  AND token = 'iU2ZT5YmPGXsuDSr069XEYgmRKu3CsUbE3e+WFWCABk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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