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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4ee96da1c555c1708173959c8e5bbcca2654df75cf0e519089d1e1367e6c11' 
  AND token = 'Ptx685m8sJH2jeqT8za+tRmh4lyGhBNX15erOVm2Xns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00168

JSON explain

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