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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9c3ef2b50897e453da4ddd48fc055b6321e801cfc1468a5ae06a19e1e3b610' 
  AND token = 'Q3ty3ZBO4Gz+t1sVkYTO3Hxl2nv9+OAO9Itx3Ik97Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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