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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2593069b1eb4d3ff690e42f3cb29ff242e6d1370138441581689c91b718cbe6' 
  AND token = '+9E/W0JoSyRA/PM3z9Fgb9MLFWlOUCCi1tuZnd1CloY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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