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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8339afa7cbac67f08fb6bc65ed2129d045f6a819a600574010e3d63a08600ee' 
  AND token = '1MEcmd+u8DQGM+WR5b3z2LL9Vkfk0jcwqnbRwv/p8GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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