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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d25a7dd2387ebacae754f0f8c512cc06b6d504bf54efe4ded9c9fc8d7cc6ec' 
  AND token = 'AhOyq9RIFeK9yt7MICyUxyGrTwoNFnggDoHk5nCPh8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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