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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12c675514a6bb71dee66891d2ef04d348f22417ae07a8d2e8fbb5823ee76abb' 
  AND token = '8iJG1GTRt2dctvd36M1Q85TTbexbuF26bZbrMMIp3Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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