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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bf24208053bc1e71e994ebcf26caa563d852364544d3b2b6cfa03a8067affe' 
  AND token = 'D1WtKYzfeS8whsUTVFl3VdecerW4s2BZZjj1aVd7AZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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