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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b873c1a1c2768e440dd8e72155d4292faec09b36ad92cafcdc4b78099b3ed14' 
  AND token = '19rvZyDW3YCBO4lEQ9vemRRfha4G3fWNBT828Sg7aSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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