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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a7b5fc28e7350898bf760ec5d3398a44f224c4ab7c1e1c30ddacc94bbd86a9' 
  AND token = 'v04rwdiSBSFryU/igmDpu5UhnckhBG3khdmh+ASez0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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