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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ff932090dcefd1a272b868761adee14e4ecb675f8a1793dbc8af4d37f0baf9' 
  AND token = 'WWi5W70eggCoWSXFaPiuaYK/rYw4+2W8FWTPcu9uLEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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