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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7852a28f223778d258c38d9c205a4f252bac9939c689cd90c709af6ce505f811' 
  AND token = 'qK66TrCoCqOhcXTbuq086g9f2yxKBBWPs81m2IyFbxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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