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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1644ef5e6795dbdc01813cc12c2181b0140350e8942ac2f8313f4e90cff20c11' 
  AND token = 'd/r9LTLOyujC/sdjvmmD5ojiHW5y2XLUeYeCUViHLAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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