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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebee714688087e09e7894dbf6e04f6ba196a79d87a9423414cea0d5c11f756d' 
  AND token = 'gqg12w1Pw/ArmsUfKSER96ZTEp49ZrIouO3FKStwQ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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