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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49941d65c92703d5047d1ee12defa36f01a219c41568d8c5c5094b24f15ff0e1' 
  AND token = 'fY/Tri709mUJYiPSzih4d9lNldEObCx4pYOsA+ClowY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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