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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd655cd80af53ab9d7f04d903cad53d2b06370fcea40e42281065ebbe8d4caeb4' 
  AND token = '/4Wm8bsJepssq1qaHcR92B11lWtgCAL7UKjM8FERMGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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