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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620560dad2cfe11aa8659caebf9f14108c3888afd0757162fa70dfa9d1383f9c' 
  AND token = '9CwUA5NSnPn37b20IfOWEucrC3wnfGBGS9iDS4JjJbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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