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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6726e7d89f1be6ae25f000b3b1cc1f337339bc292fda002ae53db8ad6ac0d0a' 
  AND token = 'W62a1DNm2DYe9/i3xlxDcoveivQaWHnmXOumya/0lBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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