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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01edf7aba2fb049b1f79c5bee52f87462c03fab0476fc7c20f788ee6c05e2a3' 
  AND token = 'sSak6u9FMdYFRZ/CrnehzCZOjQEHkGe2FCm/x4m9e6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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