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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83460e5ff33e873b436e6c9812c4d5d8c0a94cb01f0b41a5fb46c0f80497cfbf' 
  AND token = 'J3yyX7Ve4CLeqjzpMrTLkl3+VXs2CFoPFJg1VSMmcgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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