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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c682dde992f5e73263d8f4cc5de403d0dda53758df400c24a95f3ca93a667dec' 
  AND token = 'F2VVlBr96GnEzHaXBG2rTCEvJ7HoBQywPyZ5np8mGWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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