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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce633adc3d0cc02e80e4e5848032fa18c43d460be40dbcf68d3fe22bd61dfcf' 
  AND token = 'fDPtp+NCjTZ/cvnvgBsPRbafQ7xg5lv61tBaKiSrFy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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