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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef1028ca9c966afb30679de6fe3450a20f22d4e511b1cbb3fd7645af79a717f' 
  AND token = 'LXu+ym0ozfV4+E8axRhgdA6IGhSpi+l4M58Kr6h15O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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