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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eaf2d616c6622f10fe5f94f73dc7e467438c174ab2b314ecee3c1c937a81b0c' 
  AND token = 'Q7nB/ra/Nca6NP+ZSIwGh6VOEBPJ4zKLy/BAGzcVEf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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