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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484a5106aa37de5f2b889ae48171b76c876cf07b91fc6fd0b47682a4413e7492' 
  AND token = '7wnCb5pOtLyqlZKHbdGHdcb8tKDeowTgr58lPTz6JtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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