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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854bbe34c71e30ae8959e9949ec3f4832eb711431679a970ba2fd0777cb1a1d2' 
  AND token = 'ShQhHq2ccbXuRI6i8tme582e62Q3lqTqTwNi5SXVYQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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