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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b7cb59394cbea6c1158d57353cdabfbac0a1de3da3e0228dc3d23440b0cd7d' 
  AND token = 'SoxdMFHhIxzXQCewyepQHJmLSB1e/c6twkm2dCsDSNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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