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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bc77a2f55e255cfdf3c6076bc5ad7c51a080c565c536e411a3b7437d84a588' 
  AND token = '2lc7hmDcz4pTv/NJgE7dWq20qnrmfFoSb09ZF6yL/Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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