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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4ad41e211602a202de021c90a1336f172aafe4551bcacc5fc0713d0f3bba73' 
  AND token = 'yJrR1aHbSxSwusouxiEwEc3/NpdXpILZRsHnLR9BHvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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